{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "A simple GC - MS method for the simultaneous determination of betulinic , corosolic , maslinic , oleanolic and ursolic acids was developed and applied to 38 different commercial plant extracts sold as ingredients for dietary supplements ."}
{"Chemical": ["betulinic , corosolic , maslinic , oleanolic and ursolic acids"]}